*INTERF

Data format:

One line comprising one or two values

INTERF ITETAP

Status :

Optional

Purpose :

To specify initial conditions if the cable/beam interfacing algorithm is required if the initial teta's are to be calculated

Details :

Parameter	Description
INTERF	Initial X, Y and Z conditions - INTERF = 0 does not trigger the cable/beam interfacing algorithm (Default value) - INTERF = 1 triggers the cable/beam interfacing algorithm (kinematics method) - INTERF = 2 triggers the cable/beam interfacing algorithm (energy method, more accurate)
ITETAP	Initial TETAX, TETAY and TETAZ conditions - INTERF = 0 the program will evaluate the teta's (Default value) - INTERF = 1 to set the teta's to a given initial value

Note

When the cable/beam interface is used, the initial position of the beam elements NEED NOT BE STRAIGHT. The initial configuration can be choosed as in the case of a cable structure.
ITETAP = 1 might be useful to fix an angle at some point with no degrees of freedom
DO NOT USE INTERF = 1 and ITETAP = 1 simultaneously

Examples : 1) *INTERF 1 cable/beam interfacing is triggered, teta's will be calculated by the program.

2) *INTERF 0 1 cable/beam interfacing is not triggered, starting values of teta's will be those given in NODES. Calculated by the program.

3) *INTERF 0 0 cable/beam interfacing is not triggered teta's will be calculated by the program. These are the default values and it is unnecessary in this case to use this keyword.